ra·di·ol·o·gy

[rey-dee-ol-uh-jee]
noun
1.
the science dealing with x-rays or nuclear radiation, especially for medical uses.
2.
the examination or photographing of organs, bones, etc., with such rays.
3.
the interpretation of medical x-ray photographs.

Origin:
1895–1900; radio- + -logy

ra·di·ol·o·gist, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
radiology (ˌreɪdɪˈɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the use of X-rays and radioactive substances in the diagnosis and treatment of disease
 
radi'ologist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Radiology is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

radiology
"medical use of X-rays," 1900, from radio- (see radio) + Gk.-based scientific suffix -logy "study of."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

radiology ra·di·ol·o·gy (rā'dē-ŏl'ə-jē)
n.

  1. The branch of medicine that deals with the use of radioactive substances in diagnosis and treatment of disease.

  2. The use of ionizing radiation for medical diagnosis, especially the use of x-rays in medical radiography or fluoroscopy.

  3. The use of radiation for the scientific examination of material structures; fluoroscopy.


ra'di·o·log'i·cal (-ə-lŏj'ĭ-kəl) or ra'di·o·log'ic (-lŏj'ĭk) adj.
ra'di·ol'o·gist n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
radiology   (rā'dē-ŏl'ə-jē)  Pronunciation Key 
The branch of medicine that deals with diagnostic images of anatomic structures through the use of electromagnetic radiation or sound waves and that treats disease through the use of radioactive compounds. Radiologic imaging techniques include x-rays, CAT scans, PET scans, MRIs, and ultrasonograms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
radiology [(ray-dee-ol-uh-jee)]

The branch of medicine devoted to the study of images obtained by x-ray, ultrasound, CAT scans, or magnetic resonance imaging, and to the treatment of cancer by radiation therapy.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The test is performed in a hospital radiology department or in a health care
  provider's office by an x-ray technician.
The test is done in a hospital radiology department or a health care provider's
  office.
Traditional radiology tests have not yet proven valuable for diagnosing ulcers.
The biopsy is done in the hospital, usually in the radiology suite.
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